Dynawio-electrso



- o 752,168. PATENTED FEB. 15, 1-904 HOLZWARTH. DYNAMG ELECTRIC MAGHHIB.

Pl TIOH FILED NOV 1 mm 6 u umwmnum m rrrr rr rrrrrrrr llllllllllllllllllllll v ii Witness esg 4 lxgifntor Li; W i Attorxwy HOLZVVARTH, OF ErlAi /llli OhL {El OWEN D, ltiDN'TlSCHLER 'Otllrilrih SPECIFICATION forming part of Letters Patent No. "152,168, dated February 16, 1904. Application filed November 21, 1906. Serial No. 182,057. (No nindel.)

T it y 687%: verso partitions d sposed at intervals in the 50 Beit known thatL HANsHOLZWARTH, e. citichamber reterred to, these partitions extendzenof Germany, residing in Hamilton, Butler ing from the shaft to the enlarged bore of the county, Ohio, (post-oifice address, Hamilton, laminations, the result lining that the cham- 5 Ohio,) have invented certain new and useful her surroundi he shaft is divided into a Improvements in Dynamo-Electric Machines, .ihers, one for each of the 55 of'which the following is a specification. partitions 5: in question to be This invention pertaining to dynamo-nice any appropriate manner, but tric machines relates particularly to iriprorepreferably by one of the plans hereinafter to ments in construction desig'hed to enhance the described; ll, volute separators disposed in carrying away of the heat due to Foucault curthe air-spaces and serving as spacing-nieces 6 rents. In the case of dynamos directly corn and serving also 213 vanes to facilitate the outnccted to steam-turbines the speed may beward discharge of the air; 10, light metallic come extraordinarily high and the radiati shells, hcrcii'iaiter more fully described, which 5 surfaces small. Again, in any oi the ordi may he employed to serve as linings for the n ry constr'uctions looking to the ventilation air-.=;pe.ces and as supports for the hnninaoi armatures there are angular-1y -moving tions; ii, an axial bore in the urinal";ire-shaft; ports or air-passages, and the movement of i2 lllillli'ill ll-i frein this here leading diagothe Walls of these ports through the air at the nally into the chambers '7; l3, an injector ar high speeds generally associated with the coin ranged to disclmr e cooling air or gas into the ditions referred to produce a great deal of axial here ll of the slnii't; l-l, a conduit lead- '7 noise and consume considerable power. 'lhe ing to the injector and udin ted for connection result of all this is that none of the ordinary pi'in riate source of supply of ventilatii'ig systems have provcn satisfactory as under pressure.

2 5 in connection with dynamos directly connect nlustrate three of" the air-spaces edwith steam turbines. 6 to right as being walled directly by the Mypresent invention will be readily underlaminations separated at the air-space, the. stood fromithe follcwing description,takenin separators 9. that maintain the spaces and connection with the accompanying drawings, serve as air-vanes, being in the form of light in Which y channchhars bent to term and riveted to the Figure l a diametrical section of the arappropriate laniinations. The partitionslffinp- 30 mature of a dynamo-electric machine excmnropriate tothisconstruction may heohtained plifying my invention; and Fig. 2 an end View by simply cnrryin'; an up) l )})l'ltit0l t-(llSpOSGd of the same, partly transverse section. in corn group of the lnn'iinntions inwardly clear to the v junction with afield-pole appearing in'section shaft.

in a planeat right angles to the axis of the At the left oi i igr. l i illustrate i. construc- 55 armature. tion which will he :ulrantugcons in some n Inthe drawings, 1 indicates the armature as stances. in this case the air-spaces 6 instead a whole; 2-, the armature-shaft; 8, the erniaoi" having 'r wulls formed directly h}; the 4.0 tine-heads; 4, the armature-laminations; 5. iper-etch. iinntionsin'ewalled l ,\,'li;1'htcastthe tie-bolts serving to clamp the laminations he on the form cl parallel disks with 9 between the armature-heads; 6, air-spaces left the separate g-vancs i) c at nih u. in. The at intervals between contiguous laminations disks have light shell hubs linin;v is enlarged the construction as thus far particularly reports of the leminatiens, end an lllWiT-lti annuferred to doing not unusual; 7. an, annular lar projection extending inwardly from the chamber formed around the shaft Within the end of the hub to the shaft i bore of most of the laminetions, which bore 8., separati the chambers made larger than the shaft inorder to pro- The hint-ea cmninits i2 duce the general chamber in question; 8, truns- "axial bore of the shaft to the us ll partition i from the x: 7, have a double advantage by reason of their angus lar disposition relative to the axis of the shaft. The angle is favorable to the movement of the air outwardly; but the main advantage is that the shaft is less weakened than if these conduits were radial. This may not be apparent at first glance; but very little analysis will show that the amount of metal removed to form one of these conduits bears a certain proportion to the bulk of metal through which the conduit is cut and that the proportion is very much less than if the conduit ivere radial, this being due to the fact that a greater amount of the length of the shaft becomes involved in the course of a given one of these branch conduits. if one will assume a cross-sectional tube of a shaft with the branch conduit radial, it will become apparent that-the branch cond u it appears as extending entirely through the shaft from bore to periphery, while if a crosssection be assumed through a shaft provided with the angular branch conduit the conduit appears merely as a small hole in the shaft eccentrf" to the axial bore, or if a section be taken near an end of the branch conduit then the branch conduit appears as a notch in the annular portion of the shaft.

I Under some circumstances'it may not be necessary to provide for forcible injection of air to the system, the centrifugal effect of the armature upon the air 'being sufficient; but where insufiicient then the injector enforces a circulation of cooling air or gas, and conduit 14; may have connection with a blower or any other appropriate fluid-forcing means.

It will be manifest not only that the provision is made for a superior circulation for the cooling medium, but that there are no ex ternal air-admission openings having paths of motion. The axial inlet to the shaft is without motion through space, and the consequence is that the ventilating system is 'pro ductive of no noise or special loss of power. The system is equally applicable to plain armature and Pacinotti armatures, the former typebeing shown in the illustration.

In some constructions of machines where the air-gap is very small 1 make special provision for getting rid of the air-discharge from the air-spaces of the armature by causing it to pass outwardly through ventilating-apertures formed in the field-cores, which apertures may be varied in form and number. This general provision will be readily understood from Fig. 2, where 15 indicates the fieldyoke, 16 a field-core, 17 a field-pole, and 18 the air-apertures through the core.

In connection with Fig. 1 attention is particularly called to the individuality of the chambers 7, each of, which is supplied independently with air from the axial bore of the shaft. if a contindous.chamber instead of a succession of chambers were provide .l, then the air delivered from the axial bore of the reams shaft would sect: its main outlet through the G first one of the air-spaces 6 and the result would be a deficiency in cooling air delivered to the remainder of the air spaces. The present arrangement insures the delivery of air to all of theair-spaces of the armature.

I claim as my inventipn 1. n a dynamo-electric machine, the eombination, substantially as set forth, of an armature having a series of ventilating-spaces leading from the shaft outwardly and having an independent inner chamber for each of said ventilating-spaces, and an armature-shafthaving an axial conduit and having inde iendent branch conduits placing said axial conduit in communication with said inner chambers.-

2. In a dynamo-electric machine, the combination, substantially as set forth, of an armature having a series of vcntilatingspaces leading from the shaft outwardly and having an independent inner chamber for each of said ventilating-spaces, an armature-shaft having an axial conduit and having independent branch conduits placing said axial conduit in communication with said inner chambers, and means for forcibly delivering a cooling medium to the axial bore of the shaft.

3. in a dynamo-electric machine, the combihation, substantially as set forth, of an armature having a series of ventilsting-spaces leading from the shaft outwardly and having an independent inner chamber for each of said ventilating-spaces, an arn'iature-shaft having an axial conduit and having imlependent branch conduits placing said axial conduit in communication with said innerchambers, said branch conduits being arranged at an angle to the axis of the shaft.

i. In a dynamo-electric machine, the combination, substantially as set forth, of an armature-shaft having an axial conduit and having branch conduits leading outwardly therefrom, a series of laminations carried by the shaft and forming the general body of the armature and separated at intervals to form ventilating air-spaces leading from the shaft outwardly, and separators disposed within said air-spaces and formed of separated wall-disks with vanes between them and having shellhubs engaging within enlarged ports of the laminations.

5. In a dynamo-electric machine, the combination, substantially as set forth, of an armature provided with a series of ventilating airspaces leading from the shaft outwardly, an armature-shaft having an axial conduit and having branch conduits placing the same in communication with said ventilatirig-spaces, and a field-core having air-passages extending from its polar face outwardly.

HA NS 5 IOLZVVARTH.

Witnesses:

ELMMR it. Smrmv, J AM as i 'rrmv. 

